DTC P058A-01: Auxiliary Battery Monitor Module Range/Performance [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.

The battery state sensor assembly detects the auxiliary voltage, current and temperature of the auxiliary battery. The battery state sensor assembly calculates State of Charge (SOC) based on the voltage and current of the auxiliary battery and sends it to the hybrid vehicle control ECU. Based on the signals received, the hybrid vehicle control ECU adjusts the charging voltage of the DC/DC converter.

The battery state sensor assembly calculates the auxiliary battery temperature based on changes in resistance of a built-in thermistor and sends it to the hybrid vehicle control ECU. The hybrid vehicle control ECU reduces the amount of charging current based on this signal in order to protect the auxiliary battery.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	DTC Output from	Priority	Note
P058A-01	Auxiliary Battery Monitor Module Range/Performance	Any of the following conditions is met with the ignition switch ON (1 trip detection logic): The current is 999.939 A or more, or -1000 A or less for 3.2 seconds or more. A current detection circuit malfunction signal is received. The auxiliary battery temperature is 105°C (221°F) or more or -40°C (-40°F) or less for 12.288 seconds or more. A temperature detection circuit malfunction signal is received. The voltage is 15.98 V or more, or 6.0 V or less for 3.2 seconds or more. A voltage detection circuit malfunction signal is received. A writing error occurs in the auxiliary battery state sensor internal memory (battery identification data). A pulse discharge circuit malfunction condition continues for 4.608 seconds or more. The difference between the maximum and minimum current is 0.0305 A or less for 100 seconds or more.	Battery state sensor assembly Auxiliary battery Wire harness or connector	Does not come on	Charge warning is not displayed	Hybrid Control	B	SAE Code: P058A

DTC DETECTION CONDITION

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	Ignition switch is ON	◦	◦	◦	◦	◦	◦
Malfunction Status	Current value is 999.939 A or more	◦	-	-	-	-	-
	Current value is -1000 A or less	-	◦	-	-	-	-
	Current detection circuit malfunction condition is received	-	-	◦	-	-	-
	Auxiliary battery temperature is 105°C or more	-	-	-	◦	-	-
	Auxiliary battery temperature is -40°C or less	-	-	-	-	◦	-
	Temperature detection circuit malfunction signal is received	-	-	-	-	-	◦
Detection Time		3.2 seconds or more	3.2 seconds or more	-	12.288 seconds or more	12.288 seconds or more	-
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	1 trip

DTC DETECTION CONDITION

		Vehicle Condition
		Pattern 7	Pattern 8	Pattern 9	Pattern 10	Pattern 11	Pattern 12
Diagnosis Condition	Ignition switch is ON	◦	◦	◦	◦	◦	◦
Malfunction Status	Voltage value remains at 15.98 V or more	◦	-	-	-	-	-
	Voltage value remains at 6.0 V or less	-	◦	-	-	-	-
	Voltage detection circuit malfunction signal is received	-	-	◦	-	-	-
	Writing error occurs in auxiliary battery state sensor internal memory (battery identification data)	-	-	-	◦	-	-
	Pulse discharge circuit malfunction condition continues	-	-	-	-	◦	-
	Difference between maximum and minimum current is 0.0305 A or less	-	-	-	-	-	◦
Detection Time		3.2 seconds or more	3.2 seconds or more	-	-	4.608 seconds or more	100 seconds or more
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.